The Ontario Building Code | Thickness and Width
9.27.6.2. Thickness and Width
(1) Drop, rustic, novelty, lapped board and vertical wood siding shall be not less than 14.3 mm thick and not more than 286 mm wide.
(2) Bevel siding shall be,
(a) not less than 5 mm thick at the top, and
(b) not less than,
(i) 12 mm thick at the butt for sidings 184 mm or less in width, and
(ii) 14.3 mm thick at the butt for sidings wider than 184 mm.
(3) Bevel siding shall be not more than 286 mm wide.
In Plain Language
This cladding material must meet the thickness and width requirements set out in this article.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.